A pulse drill pressure generator

Abstract

The invention relates to a pulse WOB generator. The generator is composed of a pulse hydraulic pressure generation system and an impact type WOB transmission system. The pulse hydraulic pressure generation system includes an upper joint, an upper casing, a centering bearing, a screw turbine and a shaft. A valve system, the shaft valve system includes a turbine shaft, a bearing, a bearing end cover, a valve core, a valve seat and a balance sleeve, and the impact WOB transmission system includes a lower joint, a lower casing, a disc spring group and a pressure bearing head The generator forms periodic pulse hydraulic pressure and transmits the hydraulic pressure to the drill bit to form a periodically fluctuating WOB. The design structure of the WOB transmission system is simple, and the disc spring group will periodically change under the action of the periodically changing hydraulic pressure. Compression and elastic recovery can directly transmit the pulse hydraulic force to the bottom hole drill bit, with high pressure transmission speed and high efficiency.

Description

technical field [0001] The invention relates to a pulse pressure-on-bit generator capable of generating periodic pulse hydraulic pressure and transmitting the hydraulic pressure to a drill bit to form periodically fluctuating pressure-on-bit, belonging to the technical field of downhole impact speed-increasing tools in the oil and gas development process. Background technique [0002] After years of exploration and development, the reserves of shallow oil and gas resources in my country have continued to decrease, and drilling and development projects have gradually shifted to deep formations, unconventional oil and gas resources, and offshore oil and gas fields, which are dominated by hard rock oil layers such as carbonate rocks. The pressure loss of the drilling circulation medium is large, the drilling pressure cannot be effectively applied, and the mechanical speed of penetration is low. In conventional drilling operations, the drilling pressure is usually applied by the ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of poor impact load resistance, low working efficiency and slow pressure transmission speed of the current percussive drilling pressure-on-bit generator, the present invention provides a pulse pressure-on-bit generator, which can generate periodic liquid pulse pressure and transmit it through the pressure on drill The system forms a pulsed WOB acting on the drill bit at the bottom of the well, and with the rotary torque provided by the drilling rig or the downhole power drilling tool, the operation mode of rotary percussion drilling can be realized at the bottom of the well, so as to increase the mechanical penetration rate and improve the drilling work efficiency

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